Home / 21,286.57-31,918.76-7,948.59

Finding the Fourth Proportional to 21,286.57, 31,918.76 and 7,948.59

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Solution

The fourth proportional to 21,286.57, 31,918.76 and 7,948.59 is: 11,918.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,286.57 : 31,918.76 = 7,948.59 : x
  2. Step 2: Convert to fraction form
    21,286.57/31,918.76 = 7,948.59/x
  3. Step 3: Cross multiply
    21,286.57x = 31,918.76 × 7,948.59
  4. Step 4: Simplify right side
    21,286.57x = 253,709,276.12
  5. Step 5: Solve for x
    x = 253,709,276.12/21,286.57
  6. Step 6: Final answer
    x = 11,918.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.